This is just a brief summary, but after you are rooted and restart in Amon's Recovery following the instructions in either of those two methods, use the menus to do the following:

- Nandroid backup your setting now, in case you need to go back to what you have
- From the wipe menu, do the option wipe data/factory reset
- From the main menu, go to the option to flash a new zip file and choose the file that you downloaded earlier
- When it is done, choose the option to reboot your phone. It should take a while to restart - perhaps as long as ten minutes - but then you should be ready to set the phone up using your Google account and then reinstall your applications.